白璧微瑕(bái bì wēi xiá)-A slight blemish on a piece of white jade. Used to describe a small mistake . 白: white. 璧: a piece of jade with hole in it. 微: slight. 瑕: defect, flaw.例句: 就算是公司裡最年長的員工也會出錯，然而這小錯只是白璧微瑕而已無傷大雅。Example: Even the most senior staff in the company makes mistakes, but this one is just a small mishap that won’t hurt the company’s image.

無可匹敵 (wú kě pǐ dí)-Unparallelled; unique in kind or quality. 無: none. 可: able. 匹敵: to rival or equal.例句: 自國中他的英語能力便無可匹敵，所以他的托福考了滿分我們一點也不訝異。Example: His English language skills have been unparalleled to his peers since middle school, so we were not at all surprised when he got a perfect score on his TOEFL exam.

冒冒失失 (mào mào shī shī)-Lacking care, acting in haste. 冒: risk. 失: to lose, to make a mistake, to neglect.例句: 他冒冒失失的態度讓老闆無法給予全權的信任。Example: Bob’s lack of attention to detail has made it difficult for Bob’s boss to extend his full trust.